Arc-lamp for stereopticons, &amp;c.



H. P. PATTON. 'l ABC LAMP POR STEREOPTIGONS, dw. APPLICATION FILED MAY 13, 1907.

904,564()s Patented Nov.24, 1908.

2 SHEETS-SHEET 1 2h n essay,- @2l/afan H. F1 PATTON. ABG LAMP FOR STEEEOPTIGONS &o.

APPLICATION. FILED MAY 13, 19

Paten'ed Nov. 24, 1908.

2 SHEETS-SHEET 2.

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QQ/QQ?? UNITED sTATEs PATENT oEEIoE HERBERT F. PATTON,- OF CLEVELAND, OHIO.

maar Fn srnanorrrcons, ae.'

Specication o! Letters Patent.

Patented Nov. 24, 1908.

Application led lay 13, 1907. Serial No. 373,214.

To all whom it may concern:

Be it.- known that I, HERBERT F. PA'rroN, citizen of the United States; resident -of (Beveland, county of Cuyahoga, and State of Ohio, have invented a new and useful Improvement in Arc-Lamps for Stereopticons or the Like, ot' which the following is a specification, the principle ot' the inventionv being herein explained and the best mode in which I have contemplatedv applying thatv principle, so as to distinguish it from other inventions.

.'.This my presentinvention relates to 1mpiovcments in arc lamps, and particularly in arc lamps designed fonuse in stereoptilcoirs, magic lanterns.` or similar optical instruments, wherein it is necessary or desirable to have the light employed in the instrument proceed from a fixed pointwith respect to a system of lenses or the like. As needs no explanation, there has been considerable difticulty ein-omitered in theemployment of arc of the magic lantern or stereopticon. It is with a viewy to overcoming these several diff iculties that my invention has been devised, said invention consisting of the means hereinafter fully described and particularly pointed out in the claims.

The annexed drawings and the following description set forth i-n detail certain mechanism embodying the invention, such disclosed means constituting, however, but one of various mechanical forms iii/which the principle of the invention may be used.

Insaid annexed drawings: Figure 1` 'is a plan view of an arc lamp, with the carbons removed therefrom, embodying in one approved form the several improvements constituting my invention; Fig. 2 is. a side elevation of the same with the carbons shown. in position thereon; Fig. 3 is a diagrammatic plan re resentation of` the relative arrangement efp my lamp and the lensesof the magic lantern where a direct current is employed for operating. the lamp; Fig. 4 is a snilar representation of the arrangement maintaining where alternating instead of direct cur rent is employed; Fi 5 is a transversecross section taken on the ne 5 5, Figs.1 and 2; Fig. 6 is a side elevation of a stereopticon showing my improved varc lamp operatively positioned with respect thereto; and Fig. 7 is a longitudinal cross section of one arm of the lamp and parts appurtenant thereto.

As will be seen from an inspection of the drawings just describedthe mechanism constituting my im roved lamp isfsuitably mounted in a tubular base Athat is desivned to be secured in the base of the box o? the lantern or stereopticon, inwhich the lamp is housed, Fig. 6. Such variation as may be quired to adapt base A for use in diierent types of lanterns is ofcourse comprehended the detailed construction of the oase to ing no part. ofthe present invention andt here shown being merely typical. ot' the lamp proper comprises a circular p B bearing on its under side a pin or stud ifi that is adapted to fit in tub'ular base A. By means of a set screw (1, mounted in the latter the plate B may be secured in any desired angular position about the pivotal axis thus provided. Horizontally projecting from.

base plateB of the lamp and at right angles to cach other are-two arms B B2. The terminal portions b3 bt' of these arms are bent upwardly and form bea-rm s for the outer ends ot' threaded feeding ro s b b2, the inner ends of which arelmounted in .similar bearings provided in an upwardly turned flange b5 integral with plate The one feed shaft Z/-is hollow, as is the usual construction, and within the sameis disposed a second shaft b that bears on its inner end, above late B',

a bevel gear b? meshing with a simi ar gear b on the inner end of shaft b2. By-means of milled feeding wheels b, b mounted on the respective outer en'ds of tubular and inner shafts b b, such shafts may be rotated either separatelyor both together. Shafts L and b2 are exteriorly screw threaded and engage with correspondingly threaded nuts c constituting the. basemembersof the carbon holders C. Such base members 4ot the hold.-` ers C rcst slidably 'on the arms B', BL h'orilzontally projecting from plate B, Fig. 5..

Upon the upper lface of each of these members are provided carbon clamps-consisting of two transversal slidable clamp members c that are o enc and closed with respect to eachother y means of an adjusting screw c2 rotatably mounted on the top of the base members land having oppositely threadedy Vtive horizontally extending arms B B2 ofY portions respectively engaggng the two clamp members, as will be readilg,`r understood.

Having thus described the mechanisin'ot' my improved arc lamp the inode of its operation when in use may be easily explained.

The carbons D secured in the carbon holders will obviously lie parallel with the respecconstruction along with the disposition of the pivotal axis of the device, whereby the intersection of the central lines of the carbons is located in such axis. Upon, a proper spective carbons with their supporting arms adjustment hence, of the holders C along such arms it will be evident that the points of the carbons 'will be 'brought into juxta- -positionl directly over the plate B. Such plate in turn, it will be recalled, is located directly over the pivotal axis about which the device as a whole is capable of swinging. This axis being once accurately located with respect to the optical axis'of the condenser lens, in .connection with which it is desired to employ the lamp, it will be evident that no further adjustment in this particular will be necessary, either laterally or vertically..

Once the proper focus Ahas been determined,

the only possible adjustment, in other words,

that is required while the lamp is in operation, is to bring the two pointsvot the carbons suiiiciently close together to cause thev formation of the arc when the current is turned on. This adjustmentis performed with facility by the means provided. Where the direct current is employed. the positive carbon is obviously advantageously disposed parallel with the axis orp the lens system or' the instrument, since the crater formed in the end of such carbon constitutes the superior source of light.. This is the arrangement illustrated in Fig. 3. W'here, however, the alternating current is employed, the consumption, or burning away, of the carb'ons being equal, it is well recognized that it is desirable to have the two carbons disposed a-t an equal angle with respect to such axis. This disposition, in the-case at hand, is easily accomplished by simply swinging the lamp about its pivotal axis until the relie at an angle vof forty-tive degrees to such axis, Fig. e.

So far as maintaining the luminous ointof light, or the arc, specifically spea ing,

properly centered, is concerned, it will be clear no more diiculty is to be apprehended the troubles incident to a' similaruse of pr'e-4 vailing types of lamps, althoiwh in many no .provision for suoli use is made at all. It is nally to be noted that any of the various sizes of electric arc lamp carbons in current commercial use may be employed in my improved lamp. The limitations as to length and diameter imposed in present lamp constructions being, done away with, this for the reason that as seen the carbons arev centered Whatever their diameter, and both carbons projecting laterally in a horizontal plane the unconsumed portion can be easily accommodated, which is not 4the case in most types of lantern mounted as they are on solid bases Where the carbon rods are both vertical, or the one/vertical and the other horizontal.

Other modes of applying the principle ot' my invention may be employed instead ot" 'justable along such linesand being jointl oscillatory about an axis passin the point of intersection of suc right angles tosuch plane.

2. In a stereopticon or the like, the cointhrong lines at bination with the-lens system, of an arc' lamp comprising a horizontal support pivotally mounted about a vertical axis intersecting the axis of such system, said support being formed with two arms extending radially with respect to such vertical axis, and carbon holders adjustable along said arms respectively and adapted to support carbons parallel therewith.

3. In a stereopticon or the like, the combination with the lens system, of an arc lamp-comprising a horizontal plate pivotally mounted about a vertical axis intersecting the axis of such system, said plate being vertically adjustable and bein provided with two horizontal arms extending radially with respect to such pivotal axis and carbon holders adjustable along such arms respec-.

tively 'and adapted to support carbons parallel therewith.

4. In a stereopticon or the like, the combination with a suitable base, of a lens system and -an arc lamp supported thereon, said arc lamp comprising a 'horizontal plate pivotally mounted about a vertical axis in 'said base intersecting the axis' ofsuch system, said plate being vertically adjustable and. provided with two relatively rec-tangu larl57 disposed horizontal arras extending radially with respect to suchpivotal axis, 'a shaft rotatably mounted parallel with each of said arms, a carbon holder movably mounted along' each oft said arms and having threaded engagement with the corresponding shaft, said holders being adapted to support earbons centrally over and in aline-v inent with the corresponding arms', and means for rotating said shafts independently of each other.

ln a stereoptioon or the like, the coinbination With a lens system, of an arc lamp comprising a horizontal support pivotally mounted about a Vertical axis interseetii'ig the axis of such system, said support being fornied with two arnis extending radially with respec tosuoh 1vertical axis, and a carbon holder mov-ably mounted along each of said arms, eaoh of said holders ineluding two clamp members mounted soI asy to be movable transrersely of the corresponding arm and an adjusting screuY provided with oppositely threaded portions engaging said Clamp members respectively. f

'(3. ln a stereopticon .or the like, the conibination With a suitable base, of a l lens 4Systein and an arc lamp mounted thereon, said lamp comprising a horizontal plate pivotally 30 mounted Vabout a Vertical anis in said base and intersecting the anis of such system, said plate being provided with two relatively rec#l tangularly disposed horizontal arms extending radially with respect to said pivotal 3 axis, shaft rotatabiy mounted parallel with each of said arms, e carbon holderv niovably mounted along each of said arms,

each of said holdersvineluding a base membei' haring threaded engagement with said 40 corresponding" shaft, two clamp' members mounted so as to be transverselx,7 movable on 'r attested by:

l. Bloei),

JM). F. OBERLIN.

5! HERBERT F. PATTN. n I 

